Bug Description

Although Linux desktops are different, but it would be good if similar features had same shortcuts in all of them.
This is good for accessibility and for power users migrating from Gnome Shell to Unity and vice versa.
Therefore, I would suggest that Unity has the following additional shortcuts by default (already configurable through Compiz Config):

Alt+` (back tick) to switch between windows of the same application
Alt+Esc to switch to next window without showing switcher

We certainly try to fit the brain of our users, most of whom have some
background expectations from former versions of Ubuntu, the Mac or even
Windows. We can't aim both to be perfectly compatible with another
environment AND firmly grounded in our own user experience, so
compatibility on this front is a nice-to-have and not a requirement.